Emanuel and McCarthy have vowed to track down Hadiya's killer, who sprayed a crowd of teens with bullets, apparently believing rival gang members were among them. A $40,000 reward has been offered for information leading to the capture of the killer.

Nathaniel Pendleton told DNAinfo that he won't feel any closure until those responsible for his daughter's death are convicted.

"That’s what will actual bring closure — knowing those guys are off the streets," he said. "I would love to know that these guys become poster children for criminals, that even the worst criminal won’t want to be who those guys are."